Jack



July 24., 1923. 1,462,878

G. W. WILLIAMSON JACK Filed March 30 1922 2 Sheets-Sheet 1 July 24,1923. 1.462.878

- G. W. WILLIAMSQN JACK Filed March so 1922 2 Sheets-Sheet 2 WZWMPatented July 24, 1923.

htthi GEORGE WARREN WILLIAMSON, OF INDIANAPOLIS, INDIANA.

JACK.

Application filed March 30, 1922. Serial No. 547,979.

To all whom it may concern:

Be it known that I, GEORGE VZARREN Win LIAMSON, a citizen of the UnitedStates, residing at Indianapolis, in the county of Marion and State ofIndiana, have invented a new and useful Jack, of which the following isa specification.

The object of my invention is to produce an efiieient lifting jack, theload-engaging member ofwhich may be either raised or lowered by propermanipulation of the operating lever without preliminary adjustment ofany other member.

The accompanying drawings illustrate my invention: Fig. l is anelevation of one side of a jack embodying my invention; Fig. 2, anelevation of the other side; Fig. 3, a fragmentary section of the baseshow.- ing an adjacent portion of the main stem; Fig. 4, an elevation ofthe removable section of the operating lever; Fig. 5, a perspective ofone of the clutch members; Fig. 6, a section on line 6-6 of Fig. 9, ofthe load-carrying unit; Fig. 7, a sectionon line 77 ofFig. 6 with theparts inposition for lifting action; Fig. 8, a section, on me plane ofFig. 7, with the parts in position for lowering action; Fig. 9, asection on line 99 of Fig. 6; Fig. 10, a section on line 10-10 of Fig.7; and Fig. 11, a section on the plane of Fig. 10 with the parts shiftedas in a lowering action. r

In the drawings, 20 indicates a main stem, preferably of channel crosssection, provided at its upper end with a head 21 having a lateralprojection to which is pivoted a depending finger 22 so as to form ahook having a recess 23 so that the structure may be hung upon asupport.

Finger 22 is separably pivoted on head 21 by a bolt 24 and swing in onedirection is limited bya stud 25 cooperating with a stop-shoulder 26.Finger 22 is provided with a gripping cam 27 cooperating with a grippingsurface 28 so that a wire or similarobject may be gripped.

Stem 20 is supported by a base 29, either in the position shown in Figs.1 and 2, or in Fig. 3 and is retained by the movable bolt 30. Base 29 isprovided with a primary socket 31, in which stem 20 may be supportedvertically, and with lateral openings 32 and 32 which permit support ofstem 20 in either. direction horizontally as indicated in Fig. 3.

Longitudinally slidable on stem 20 are two clutch members or climbingmember 35, capable also of a slight lateral movement, at right angles tothe wearing-faces 20 of stem 20. Each member 35 carries a gripper block36 seated somewhat loosely in a pocket 37 which preferably has a convexbottom, as shown at 38, and the gripper block is so formed that, when inengagement with face 20, downward movement of member 35 on stem 20 isprevented.

Also slidably mounted on stem 20 is a load-engaging member 40 havingrollers 41, 41,'engaging stem 20, and a load-receiving step 42. p

Member 40 is provided, opposite the channel of stem 20, with twovertically-spaced eyes 43 and 44 into which are projected the upper andlower fingers 45 and 46 ofend of a pin 55, upon the'stem 20,the arrangement being such that spring 53'yieldingly holds the clutch blocks36 against face 20' of stem 20. z

Each carrier 35 is provided with a pro jection'57 which lies adjacent asegmental surface 58 on lever 49 and carrier 47 is per mitted to rock onstem 2 0,v as indicated h" Fig. 8, for a purpose which will appear.

Member 40 is perforated at 60 and provided with an adjacent grippingsurface.

61 with which a gripping-cam 62 may cooperate.

In order that the device. may be used as i a vise, for gripping pipe andother article's, the stem 20 may be supported as shown in Fig. 3, and Iprovide a swinging aw .70

finger 22.

Lever 49 is provided with a pocket 7i for the reception of the extensionshown in Fig. 4, said extensionhaving various nutsoclr'ets 72 so that itmaybe used as a wrench; I

In operation, oscillation of lever 49 will cause members 35 to climbstem 20 and thus which i maybe substituted for raise member 40. If,however, the lever 49 be laterally swung, alternately, in opbealternately shifted, against the action of Spring 53, so as to withdrawthe clutch blocks 36 alternately from face 20, and, as these clutchblocks only serve to resist downward movement on the stem 20, when theyare in actual engagement with face 20, it is apparent that the alternatelateral re ciprocation oflever 49' will permit the climbers 35 to beshifted downwardly on stem 20 during the period when they arelaterallydisplaced, as indicated in Figs. 8 and 11. y

The device is useful not only as a lifting jack but also as a wirestretcher and in many other Ways which, will naturally suggestthemselves, and in the claims the term lift ing jack i-s'merely used astypical rather than limiting. r

In order to obtain a continuous sliding return of the load-engagingmember along stem 20, the lever 49 may be swung to a positionsubstantially parallel with the stem. The carrier 457 may then betilted, finger i6 "fulcruming upon an adjacent portion'of the member 40,so that both of the clutch-carryingrmembers 35, 35wil1 besimultaneouslyshifted laterally to the position illustrated in the right hand side ofFig. 8; whereupon, the entire load-engaging member may be shiftedlongitudinally on stem 20 in either direction.

The tilting mentioned above is obtained by means of a cam surface 80 onlever 4-9, said cam surface 80 coming into engagement with the uppersurface of eye a l when the lever 49 is swung up parallel with stem 20.

Swing of lever 49 is limited in downward direction by engagement witheye at, as shown in Fig. 1 and, in order to prevent cam 80 from cominginto accidental engagement with eye 44,-, normal swing of lever 49 inthe upper direction is prevented by a projection 81 which, conveniently,is the pivot pin of the upper roller 41 and of sufficient length to bepushed lengthwise so as to occupy either a lever obstructing position orone out ofthe line of movement of the lever.

I claim as my invention:

1. A lifting jack comprising a main stem, a load-engaging membervslidably mounted on the stem, a pair of climbing members mounted on thestem and movable longitudinally and laterally, a pivoted operatinglevercarried by the load-engaging member, interengaging means betweensaid lever and climbing members for causing relative reciprocation ofthe climbing members upon oscillation of the lever, means for'normallycausing the climbing members to actively interengage with the stem inone direction of movement while permitting freedom of movement in theopposite direction, and means permitting lateral movement of the leverto cause lateral shifting of the climbers to permit reverse movement ofthe climbers on the stem.

2. A lifting jack comprising a main stem, a. load-receiving memberslidably mounted on the stem, a pair ofclutch members slidably mountedon the stem and having a clutch interengagement with the stem active inone direction only, a shiftable carrier carried by the load-engagingmember, an operating lever'pivoted on said carrier, means carried bysaid operating lever for engaging the clutch members to reciprocate thesame upon oscillation of the lever, a spring nested,

in said carrier for normallyholding the clutch members in activerelationship with the stem, the lever bemg so formed that,

by tilting its carrier it will engage the clutch member to shift it toinactive position pending and during oscillation of the lever, for thepurpose set forth.

3 A lifting jack comprising a main stem, a load-receiving memberslidablylmounted on the stem, a pair of clutch members slidably mountedon the stem and having a clutch interengagement with the stem active inone direction only, a shiftable carrier carried by the load-engagingmember, an operating lever pivoted on said carrier, means carried bysaid operating lever'fo'r engaging the clutch members'to reciprocate thesame upon oscillation of the lever, a spring for normally holding theclutch members in active relationship with the stem, the lever being soformed that, by tilting its carrier it will engage'the clutch members toshift them to inactive positions pending and during oscillation of thelever, for the purpose set forth.

4. A lifting acli comprising a main stem,

a load-receiving member slidably mounted on the stem, a pair of clutchmembers slidably mounted on the stem and having a clutch interengagementwith the stem active in one direction only, a shiftable carrier carriedby the load-engaging member, an operating lever pivoted on said carrier,means carried by said operating lever for engaging the clutch memberstoreciprocate the same upon oscillation of the lever, the lever being soformed that, by tilting its carrier on said stem, a pair of climbingmembers.

slidably mounted on the stem and provided with clutch portions activeupon the stem in one direction, rack-teeth carried by said climbingmembers, a lever carrier rockably mounted in the load-engaging member,an

operating lever pivoted on said rocking,

carrier and provided with a pinion engaging the racks of the climbers,and also provided with a portion adapted to engage and laterallydisplace the climbers upon lateral displacement of the lever and duringoscilla' tion thereof, a plate connecting said climbers, a spring nestedin the rocking carrier engaging said plate to normally urge the clutchmembers to active position.

6. A lifting jack comprising a main stem, a load-engaging memberslidably mounted on said stem, a pair of climbing members slidablymounted on the stem and provided with clutch portions active upon thestem in one direction, rack-teeth carried by said climbing members, alever carrier rockably mounted in the load-engaging member, an operatinglever pivoted on said rocking carrier and provided with a pinionengaging the racks of the climbers, and also provided with a portionadapted to engage and laterally displace the climbers upon lateraldisplacement of the lever and during oscillation thereof, a plateconnecting said climbers, a spring engaging said plate to normally urgethe clutch members to active position..

7. A lifting jack comprising a main stem, a load-engagingmember'slidably mounted on said stem, a pair of climbing membersslidably mounted on the stem and provided with clutch portions activeupon the stem in one direction, rack-teeth carried by said climbingmembers, a lever carrier roclrably mounted in the load-engaging member,an operating lever pivoted on said rocking carrier and provided with apinion engaging the racks of the climbers, and also provided with aportionadapted to engage and laterally displace the climbers uponlateral displacement of the lever and during oscillation thereof.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 28th day of March, A. D. one thousand nine hundred andtwenty-two.

GEORGE WARREN l/VILLIAMSON.

